linux-5.15/kcompactd_do_work()
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開始行:
*参照元 [#ibebb39a]
#backlinks
*説明 [#b7993f50]
-パス: [[linux-5.15/mm/compaction.c]]
-FIXME: これは何？
--説明
**引数 [#zaa333b0]
-pg_data_t *pgdat
--
--[[linux-5.15/pg_data_t]]
**返り値 [#r061ce2b]
-なし
**参考 [#b3c7f72d]
*実装 [#x24667b2]
static void kcompactd_do_work()
{
/*
* With no special task, compact all zones so that a pa...
* order is allocatable.
*/
int zoneid;
struct zone *zone;
struct compact_control cc = {
.order = pgdat->kcompactd_max_order,
.search_order = pgdat->kcompactd_max_order,
.highest_zoneidx = pgdat->kcompactd_highest_zoneidx,
.mode = MIGRATE_SYNC_LIGHT,
.ignore_skip_hint = false,
.gfp_mask = GFP_KERNEL,
};
trace_mm_compaction_kcompactd_wake(pgdat->node_id, cc.o...
cc.highest_zoneidx);
count_compact_event(KCOMPACTD_WAKE);
-
--[[linux-5.15/zone]]
--[[linux-5.15/compact_control]]
--[[linux-5.15/trace_mm_compaction_kcompactd_wake()]]
--[[linux-5.15/count_compact_event()]]
for (zoneid = 0; zoneid <= cc.highest_zoneidx; zoneid++...
int status;
zone = &pgdat->node_zones[zoneid];
if (!populated_zone(zone))
continue;
-ページを持たないゾーンは無視します。
--[[linux-5.15/populated_zone()]]
if (compaction_deferred(zone, cc.order))
continue;
-コンパクションを延期するなら、このゾーンは無視します。
--[[linux-5.15/compaction_deferred()]]
if (compaction_suitable(zone, cc.order, 0, zoneid) !=
COMPACT_CONTINUE)
continue;
-コンパクションを実施しない（結果がCOMPACT_CONTINUE以外）...
--[[linux-5.15/compaction_suitable()]]
if (kthread_should_stop())
return;
-終了すべきなら関数を抜けます。
--[[linux-5.15/kthread_should_stop()]]
cc.zone = zone;
status = compact_zone(&cc, NULL);
-コンパクションを実施します。
--[[linux-5.15/compact_zone()]]
if (status == COMPACT_SUCCESS) {
compaction_defer_reset(zone, cc.order, false);
-コンパクションに成功したので延期条件をリセットします。
--[[linux-5.15/compaction_defer_reset()]]
} else if (status == COMPACT_PARTIAL_SKIPPED || status...
/*
* Buddy pages may become stranded on pcps that could
* otherwise coalesce on the zone's free area for
* order >= cc.order. This is ratelimited by the
* upcoming deferral.
*/
drain_all_pages(zone);
/*
* We use sync migration mode here, so we defer like
* sync direct compaction does.
*/
defer_compaction(zone, cc.order);
}
-
--[[linux-5.15/drain_all_pages()]]
--[[linux-5.15/defer_compaction()]]
count_compact_events(KCOMPACTD_MIGRATE_SCANNED,
cc.total_migrate_scanned);
count_compact_events(KCOMPACTD_FREE_SCANNED,
cc.total_free_scanned);
VM_BUG_ON(!list_empty(&cc.freepages));
VM_BUG_ON(!list_empty(&cc.migratepages));
}
-
--[[linux-5.15/count_compact_events()]]
--[[linux-5.15/VM_BUG_ON()]]
--[[linux-5.15/list_empty()]]
/*
* Regardless of success, we are done until woken up ne...
* the requested order/highest_zoneidx in case it was h...
* than our current ones
*/
if (pgdat->kcompactd_max_order <= cc.order)
pgdat->kcompactd_max_order = 0;
if (pgdat->kcompactd_highest_zoneidx >= cc.highest_zone...
pgdat->kcompactd_highest_zoneidx = pgdat->nr_zones - 1;
}
*コメント [#h71cb58f]
終了行:
*参照元 [#ibebb39a]
#backlinks
*説明 [#b7993f50]
-パス: [[linux-5.15/mm/compaction.c]]
-FIXME: これは何？
--説明
**引数 [#zaa333b0]
-pg_data_t *pgdat
--
--[[linux-5.15/pg_data_t]]
**返り値 [#r061ce2b]
-なし
**参考 [#b3c7f72d]
*実装 [#x24667b2]
static void kcompactd_do_work()
{
/*
* With no special task, compact all zones so that a pa...
* order is allocatable.
*/
int zoneid;
struct zone *zone;
struct compact_control cc = {
.order = pgdat->kcompactd_max_order,
.search_order = pgdat->kcompactd_max_order,
.highest_zoneidx = pgdat->kcompactd_highest_zoneidx,
.mode = MIGRATE_SYNC_LIGHT,
.ignore_skip_hint = false,
.gfp_mask = GFP_KERNEL,
};
trace_mm_compaction_kcompactd_wake(pgdat->node_id, cc.o...
cc.highest_zoneidx);
count_compact_event(KCOMPACTD_WAKE);
-
--[[linux-5.15/zone]]
--[[linux-5.15/compact_control]]
--[[linux-5.15/trace_mm_compaction_kcompactd_wake()]]
--[[linux-5.15/count_compact_event()]]
for (zoneid = 0; zoneid <= cc.highest_zoneidx; zoneid++...
int status;
zone = &pgdat->node_zones[zoneid];
if (!populated_zone(zone))
continue;
-ページを持たないゾーンは無視します。
--[[linux-5.15/populated_zone()]]
if (compaction_deferred(zone, cc.order))
continue;
-コンパクションを延期するなら、このゾーンは無視します。
--[[linux-5.15/compaction_deferred()]]
if (compaction_suitable(zone, cc.order, 0, zoneid) !=
COMPACT_CONTINUE)
continue;
-コンパクションを実施しない（結果がCOMPACT_CONTINUE以外）...
--[[linux-5.15/compaction_suitable()]]
if (kthread_should_stop())
return;
-終了すべきなら関数を抜けます。
--[[linux-5.15/kthread_should_stop()]]
cc.zone = zone;
status = compact_zone(&cc, NULL);
-コンパクションを実施します。
--[[linux-5.15/compact_zone()]]
if (status == COMPACT_SUCCESS) {
compaction_defer_reset(zone, cc.order, false);
-コンパクションに成功したので延期条件をリセットします。
--[[linux-5.15/compaction_defer_reset()]]
} else if (status == COMPACT_PARTIAL_SKIPPED || status...
/*
* Buddy pages may become stranded on pcps that could
* otherwise coalesce on the zone's free area for
* order >= cc.order. This is ratelimited by the
* upcoming deferral.
*/
drain_all_pages(zone);
/*
* We use sync migration mode here, so we defer like
* sync direct compaction does.
*/
defer_compaction(zone, cc.order);
}
-
--[[linux-5.15/drain_all_pages()]]
--[[linux-5.15/defer_compaction()]]
count_compact_events(KCOMPACTD_MIGRATE_SCANNED,
cc.total_migrate_scanned);
count_compact_events(KCOMPACTD_FREE_SCANNED,
cc.total_free_scanned);
VM_BUG_ON(!list_empty(&cc.freepages));
VM_BUG_ON(!list_empty(&cc.migratepages));
}
-
--[[linux-5.15/count_compact_events()]]
--[[linux-5.15/VM_BUG_ON()]]
--[[linux-5.15/list_empty()]]
/*
* Regardless of success, we are done until woken up ne...
* the requested order/highest_zoneidx in case it was h...
* than our current ones
*/
if (pgdat->kcompactd_max_order <= cc.order)
pgdat->kcompactd_max_order = 0;
if (pgdat->kcompactd_highest_zoneidx >= cc.highest_zone...
pgdat->kcompactd_highest_zoneidx = pgdat->nr_zones - 1;
}
*コメント [#h71cb58f]
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